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x + 3y = -3
hilangkan salah satu variable :
4x + 2y = 8
4x + 12y = -12
menjadi
-10y = 20
y = -2
substitusi nilai y ke salah satu persamaan
4x + 2y = 8
4x + 2(-2) = 8
4x - 4 = 8
4x = 8 + 4
4x = 12
x = 3
himpunan penyelesaian {x1 , y1}: HP = {3,-2}
maka, x - y = 3 - (-2) = 3 + 2 = 5
owari,,